Air Excellent The New Air Management System from Centrotherm. A new day in air management has dawned. Providing the highest indoor air quality has become a major consideration for everyone involved in the construction process – especially the eventual homeowner. The air we all breathe has a tremendous impact on our overall health, and Centrotherm’s new Air Excellent Air Management System provides draft-free, noiseless fresh air supply to living spaces and efficient stale air exhaust from kitchens and bathrooms.